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Abstract Metal thiophosphite has demonstrated promising application potential as an anode material for sodium‐ion batteries. Nevertheless, the intrinsic low electrical conductivity and drastic volume expansion impede its commercialization. Herein, a series of metal thiophosphite/Ti 3 C 2 T x (metal = Fe, Ni, Co, and Cd) composites are constructed via Lewis acidic molten salt etching followed by synchronous phospho‐sulfurization. The Ti 3 C 2 T x substrate endows the thiophosphite/Ti 3 C 2 T x hybrids with high electrical conductivity. Importantly, thiophosphite grown on the MXene layers exhibits a 3D cross‐linked structure, which not only facilitates electron/ion transport, but also maintains robust structural stability owing to the space confinement effect. As a proof of concept, FePS 3 /Ti 3 C 2 T x demonstrates remarkable rate performance (827.4 and 598.1 mAh g −1 at 0.1 and 10 A g −1 , respectively) along with long‐term cycling stability (capacity retention of 93.7% after 2000 cycles at 5 A g −1 ). Impressively, the FePS 3 /Ti 3 C 2 T x //NVPO full cell exhibits a high reversible capacity of 396.8 mAh g −1 over 1350 cycles at 2 A g −1 . The sodium storage mechanism of FePS 3 /Ti 3 C 2 T x anode is further unveiled through in situ XRD/ex situ HRTEM characterizations and theoretical calculations. This work provides a fresh perspective on enhancing the electrochemical performance of thiophosphite through the in situ construction of thiophosphite/Ti 3 C 2 T x hybrids.
Zhong et al. (Tue,) studied this question.